MongoDB2.4系で、セカンダリのノードをパッシブにしてみた
MongoDBのバージョンは2.4.10。セカンダリになってるやつをパッシブにしてみるにはどうしたらいいかわからなかったので、試してみた。
まず起動。
mkdir -p /data/{mongo10101,mongo10102,mongo10103,mongo10104,config,logs}
# mongod
/usr/local/mongodb/bin/mongod --port 10101 --replSet=test-bk-repl --dbpath /data/mongo10101 --logpath /data/logs/mongo10101.log --fork
/usr/local/mongodb/bin/mongod --port 10102 --replSet=test-bk-repl --dbpath /data/mongo10102 --logpath /data/logs/mongo10102.log --fork
/usr/local/mongodb/bin/mongod --port 10103 --replSet=test-bk-repl --dbpath /data/mongo10103 --logpath /data/logs/mongo10103.log --fork
/usr/local/mongodb/bin/mongod --port 10104 --replSet=test-bk-repl --dbpath /data/mongo10104 --logpath /data/logs/mongo10104.log --fork
# mongoc
/usr/local/mongodb/bin/mongod --configsvr --port 10105 --dbpath /data/config --logpath /data/logs/config.log --fork
# mongos
/usr/local/mongodb/bin/mongos --configdb localhost:10105 --port 10100 --logpath /data/logs/mongos.log --chunkSize 1 --fork
レプリケーションの設定。
config = {
_id : "test-bk-repl",
members : [
{ _id : 0, host : "localhost:10101", votes: 1 },
{ _id : 1, host : "localhost:10102", votes: 1 },
{ _id : 2, host : "localhost:10103", votes: 0 },
{ _id : 3, host : "localhost:10104", votes: 1, arbiterOnly : true } ] }
> rs.initiate(config)
ひと通りレプリカセットの状態確認。db.isMaster()でパッシブにはどのプロセスもなってないことを確認する。
test-bk-repl:PRIMARY> rs.status()
{
"set" : "test-bk-repl",
"date" : ISODate("2014-04-21T09:22:45Z"),
"myState" : 1,
"members" : [
{
"_id" : 0,
"name" : "localhost:10101",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 166,
"optime" : Timestamp(1398072042, 1),
"optimeDate" : ISODate("2014-04-21T09:20:42Z"),
"self" : true
},
{
"_id" : 1,
"name" : "localhost:10102",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 116,
"optime" : Timestamp(1398072042, 1),
"optimeDate" : ISODate("2014-04-21T09:20:42Z"),
"lastHeartbeat" : ISODate("2014-04-21T09:22:43Z"),
"lastHeartbeatRecv" : ISODate("2014-04-21T09:22:43Z"),
"pingMs" : 0,
"syncingTo" : "localhost:10101"
},
{
"_id" : 2,
"name" : "localhost:10103",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 116,
"optime" : Timestamp(1398072042, 1),
"optimeDate" : ISODate("2014-04-21T09:20:42Z"),
"lastHeartbeat" : ISODate("2014-04-21T09:22:43Z"),
"lastHeartbeatRecv" : ISODate("2014-04-21T09:22:43Z"),
"pingMs" : 0,
"syncingTo" : "localhost:10101"
},
{
"_id" : 3,
"name" : "localhost:10104",
"health" : 1,
"state" : 7,
"stateStr" : "ARBITER",
"uptime" : 116,
"lastHeartbeat" : ISODate("2014-04-21T09:22:43Z"),
"lastHeartbeatRecv" : ISODate("2014-04-21T09:22:44Z"),
"pingMs" : 0
}
],
"ok" : 1
}
test-bk-repl:PRIMARY> rs.config()
{
"_id" : "test-bk-repl",
"version" : 1,
"members" : [
{
"_id" : 0,
"host" : "localhost:10101"
},
{
"_id" : 1,
"host" : "localhost:10102"
},
{
"_id" : 2,
"host" : "localhost:10103",
"votes" : 0
},
{
"_id" : 3,
"host" : "localhost:10104",
"arbiterOnly" : true
}
]
}
test-bk-repl:PRIMARY> db.isMaster()
{
"setName" : "test-bk-repl",
"ismaster" : true,
"secondary" : false,
"hosts" : [
"localhost:10101",
"localhost:10103",
"localhost:10102"
],
"arbiters" : [
"localhost:10104"
],
"primary" : "localhost:10101",
"me" : "localhost:10101",
"maxBsonObjectSize" : 16777216,
"maxMessageSizeBytes" : 48000000,
"localTime" : ISODate("2014-04-21T09:22:59.025Z"),
"ok" : 1
}
rs.config()の内容を変数に入れる。
test-bk-repl:PRIMARY> var config = rs.config()
test-bk-repl:PRIMARY> config
{
"_id" : "test-bk-repl",
"version" : 1,
"members" : [
{
"_id" : 0,
"host" : "localhost:10101"
},
{
"_id" : 1,
"host" : "localhost:10102"
},
{
"_id" : 2,
"host" : "localhost:10103",
"votes" : 0
},
{
"_id" : 3,
"host" : "localhost:10104",
"arbiterOnly" : true
}
]
}
レプリカセットに対して設定できる変数は色々あるのだけれど、パッシブにしたいので今回はpriorityを使う。 votesが0のやつにさらにpriority:0を与えて、reconfigして設定を再反映する。 reconfigするとRSとの通信はすべて遮断される。
test-bk-repl:PRIMARY> config.members[2].priority = 0
0
test-bk-repl:PRIMARY> config
{
"_id" : "test-bk-repl",
"version" : 1,
"members" : [
{
"_id" : 0,
"host" : "localhost:10101"
},
{
"_id" : 1,
"host" : "localhost:10102"
},
{
"_id" : 2,
"host" : "localhost:10103",
"votes" : 0,
"priority" : 0
},
{
"_id" : 3,
"host" : "localhost:10104",
"arbiterOnly" : true
}
]
}
test-bk-repl:PRIMARY> rs.reconfig(config)
Mon Apr 21 18:26:21.467 DBClientCursor::init call() failed
Mon Apr 21 18:26:21.467 trying reconnect to 127.0.0.1:10101
Mon Apr 21 18:26:21.468 reconnect 127.0.0.1:10101 ok
reconnected to server after rs command (which is normal)
パッシブに加わったことを確認。
test-bk-repl:PRIMARY> db.isMaster()
{
"setName" : "test-bk-repl",
"ismaster" : true,
"secondary" : false,
"hosts" : [
"localhost:10101",
"localhost:10102"
],
"passives" : [
"localhost:10103"
],
"arbiters" : [
"localhost:10104"
],
"primary" : "localhost:10101",
"me" : "localhost:10101",
"maxBsonObjectSize" : 16777216,
"maxMessageSizeBytes" : 48000000,
"localTime" : ISODate("2014-04-21T09:26:40.602Z"),
"ok" : 1
}
以上。Mongoシェルは補完してくれるから助かるけど、コマンドなかなか覚えられぬ。
